| // Copyright 2015 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| func TestFastLog2(t *testing.T) { |
| // Compute the euclidean distance between math.Log2 and the FastLog2 |
| // implementation over the range of interest for heap sampling. |
| const randomBitCount = 26 |
| // Check 1K total values, down from 64M. |
| for i := 1; i < 1<<randomBitCount; i += inc { |
| l, fl := math.Log2(float64(i)), runtime.Fastlog2(float64(i)) |
| t.Fatalf("imprecision on fastlog2 implementation, want <=1.0, got %f", e) |